Yamanaka Shikanosuke Yukimori (1543-1576), popularly known as the 'samurai of the crescent moon' was vassal in the service of Amago Katsuhisa (1553-1578) of the Amago clan of Izumo Province. When Kozuki Castle was laid siege by the Mori clan in 1578, Yukimori sought the help of Oda Nobunaga (1534-1582), who ultimately used the siege as an opportunity to advance his own agenda and failed to provide any support, allowing the castle to fall and Katsuhisa to commit seppuku. Yukimori's fate is not clear, in some versions of his legend he dies at the castle, in others he is murdered by members of the Mori clan shortly thereafter.

He often depicted wearing a crescent moon on his helmet, believed to have protective powers and emblematic of the harvest moon under which he was born. He is conventionally shown at a shoreline while deep in prayer to the moon (which appears to be a lunar eclipse in this case) in preparation for a duel with a vassal of the Mori clan named Shinagawa Daisen on an island located on the Toda River in 1565; an encounter from which he emerged victorious.